Sameer DCosta wrote: > Hi, > > I'm having trouble renaming record array fields if they contain object > arrays in them. I followed the solutions posted by Robert Kern and > Stefan van der Walt (Thanks again) but it doesn't look like this > method works in all cases. For reference: > http://projects.scipy.org/pipermail/numpy-discussion/2008-February/031509.html > > In [1]: from numpy import * > > In [2]: olddt = dtype([('foo', '|O4'), ('bar', float)]) > > In [3]: a = zeros(10, olddt) > > In [4]: a > Out[4]: > array([(0, 0.0), (0, 0.0), (0, 0.0), (0, 0.0), (0, 0.0), (0, 0.0), > (0, 0.0), (0, 0.0), (0, 0.0), (0, 0.0)], > dtype=[('foo', '|O4'), ('bar', '<f8')]) > > In [5]: newdt = dtype([('notfoo', '|O4'), ('notbar', float)]) > > In [6]: b = a.view(newdt) > --------------------------------------------------------------------------- > TypeError Traceback (most recent call last) > > /home/titan/sameer/projects/<ipython console> > > TypeError: Cannot change data-type for object array. >
This looks like a bug. We are being a bit over-zealous in protecting you from getting access to pointers and in the process making it impossible to rename Object fields. Perhaps an actual field-renaming API (which would be relatively easy) is useful. -Travis O. _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
